Do not understand why the NPN transistor emitter current is negative

Discussion in 'Electronics Resources' started by eletmoraes, Jan 20, 2015.

  1. eletmoraes

    Thread Starter New Member

    Apr 18, 2011
    2
    0
    Analyzing the circuit created in Orcad get a negative current in the transistor, as the image below.
     
  2. MikeML

    AAC Fanatic!

    Oct 2, 2009
    5,450
    1,066
    Orcad must use the convention that "current into any component pin is positive". Since in this circuit, current is actually flowing out of the emitter pin, then it puts a minus sign in front of it.
     
    ~EEC~ likes this.
  3. crutschow

    Expert

    Mar 14, 2008
    13,001
    3,229
    Most simulators use the convention that current into a device pin is positive.
    That may seem counter-intuitive but that's the convention.
     
  4. atferrari

    AAC Fanatic!

    Jan 6, 2004
    2,648
    762
    Not so long ago, maybe just two days, I asked the same question.

    Now, I feel more confident, let me tell you.

    Acredite!
     
Loading...